blocks|key|4389550|text|在SupportLibrary+25.1.0中似乎是固定的:)编辑:当旋转屏幕时，选择的状态被保存，这似乎是固定的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4389551|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Seems to be fixed in SupportLibrary 25.1.0 :)
Edit: It seems to be fixed, that the state of the selection is saved, when rotating the screen.

blocks|key|4389247|text|要以编程方式单击需要使用的BottomNavigationBar项：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4389248|View+view+=+bottomNavigationView.findViewById(R.id.menu_action_item);
view.performClick();|code-block|syntax|javascript|4389249|这会正确地排列所有带有标签的项目。|4389250|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

To programmatically click on the BottomNavigationBar item you need use:

<pre><code>View view = bottomNavigationView.findViewById(R.id.menu_action_item);
view.performClick();
</code></pre>

This arranges all the items with their labels correctly.

blocks|key|4389844|text|bottomNavigationView.setSelectedItemId(R.id.action_item1);|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|4389845|其中action_item1是菜单项ID。|unstyled|offset|length|style|CODE|4389846|entityMap^0|0|2|C|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|N|8|@$G|O|H|P|I|J]]|9|@]|A|$]]|$1|K|3|-4|5|F|7|Q|8|@]|9|@]|A|$]]]|L|$]]

<pre><code>bottomNavigationView.setSelectedItemId(R.id.action_item1);
</code></pre>

where <code>action_item1</code> is menu item ID.

blocks|key|4389964|text|使用此选项可按菜单id设置选定的底部导航菜单项|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4389965|MenuItem+item+=+mBottomNavView.getMenu().findItem(menu_id);
item.setChecked(true);|code-block|syntax|javascript|4389966|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Use this to set selected bottom navigation menu item by menu id

<pre><code>MenuItem item = mBottomNavView.getMenu().findItem(menu_id);
item.setChecked(true);
</code></pre>

blocks|key|4389515|text|@Override
protected+void+onCreate(Bundle+savedInstanceState)+{
++super.onCreate(savedInstanceState);

+++bottomNavigationView.setOnNavigationItemSelectedListener(this);
+++Menu+menu+=+bottomNavigationView.getMenu();
+++this.onNavigationItemSelected(menu.findItem(R.id.action_favorites));
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|4389516|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>@Override
protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);

 bottomNavigationView.setOnNavigationItemSelectedListener(this);
 Menu menu = bottomNavigationView.getMenu();
 this.onNavigationItemSelected(menu.findItem(R.id.action_favorites));
}
</code></pre>

blocks|key|4389708|text|从25.3.0版本开始，现在可以调用setSelectedItemId()+\o/|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4389709|entityMap^0|I|J|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

It is now possible since 25.3.0 version to call <code>setSelectedItemId()</code> \o/

blocks|key|4389525|text|使用|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4389526|++++++++bottomNavigationView.getMenu().getItem(POSITION).setChecked(true);|code-block|syntax|javascript|4389527|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

use
<pre><code> bottomNavigationView.getMenu().getItem(POSITION).setChecked(true);
</code></pre>

blocks|key|4389780|text|向BottomNavigationMenu项目添加android:enabled="true"。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4389781|然后设置bottomNavigationView.setOnNavigationItemSelectedListener(mListener)并通过执行bottomNavigationView.selectedItemId+=+R.id.your_menu_id将其设置为选中状态|4389782|entityMap^0|P|M|0|4|1V|24|1J|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|H|3|-4|5|6|7|R|8|@]|D|@]|E|$]]]|I|$]]

Add <code>android:enabled="true"</code> to BottomNavigationMenu Items.

And then set <code>bottomNavigationView.setOnNavigationItemSelectedListener(mListener)</code> and 
set it as selected by doing <code>bottomNavigationView.selectedItemId = R.id.your_menu_id</code>

blocks|key|4388987|text|这可能会在即将到来的更新中添加。但在此期间，您可以使用反射来完成此任务。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4388988|创建一个从BottomNavigationView扩展的自定义视图，并访问其中的一些字段。|4388989|public+class+SelectableBottomNavigationView+extends+BottomNavigationView+{

++++public+SelectableBottomNavigationView(Context+context)+{
++++++++super(context);
++++}

++++public+SelectableBottomNavigationView(Context+context,+AttributeSet+attrs)+{
++++++++super(context,+attrs);
++++}

++++public+SelectableBottomNavigationView(Context+context,+AttributeSet+attrs,+int+defStyleAttr)+{
++++++++super(context,+attrs,+defStyleAttr);
++++}

++++public+void+setSelected(int+index)+{
++++++++try+{
++++++++++++Field+f+=+BottomNavigationView.class.getDeclaredField("mMenuView");
++++++++++++f.setAccessible(true);
++++++++++++BottomNavigationMenuView+menuView+=+(BottomNavigationMenuView)+f.get(this);

++++++++++++try+{
++++++++++++++++Method+method+=+menuView.getClass().getDeclaredMethod("activateNewButton",+Integer.TYPE);
++++++++++++++++method.setAccessible(true);
++++++++++++++++method.invoke(menuView,+index);
++++++++++++}+catch+(SecurityException+%7C+NoSuchMethodException+%7C+IllegalAccessException+%7C+InvocationTargetException+e)+{
++++++++++++++++e.printStackTrace();
++++++++++++}
++++++++}+catch+(IllegalAccessException+e)+{
++++++++++++e.printStackTrace();
++++++++}+catch+(NoSuchFieldException+e)+{
++++++++++++e.printStackTrace();
++++++++}
++++}

}|code-block|syntax|javascript|4388990|然后在xml布局文件中使用它。|4388991|<com.your.app.SelectableBottomNavigationView
++++++++android:id="@%2Bid/bottom_navigation"
++++++++android:layout_width="match_parent"
++++++++android:layout_height="wrap_content"
++++++++app:itemBackground="@color/primary"
++++++++app:itemIconTint="@drawable/nav_item_color_state"
++++++++app:itemTextColor="@drawable/nav_item_color_state"
++++++++app:menu="@menu/bottom_navigation_menu"/>|4388992|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Q|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

This will probably be added in coming updates. But in the meantime, to accomplish this you can use reflection.

Create a custom view extending from BottomNavigationView and access some of its fields.

<pre><code>public class SelectableBottomNavigationView extends BottomNavigationView {

 public SelectableBottomNavigationView(Context context) {
 super(context);
 }

 public SelectableBottomNavigationView(Context context, AttributeSet attrs) {
 super(context, attrs);
 }

 public SelectableBottomNavigationView(Context context, AttributeSet attrs, int defStyleAttr) {
 super(context, attrs, defStyleAttr);
 }

 public void setSelected(int index) {
 try {
 Field f = BottomNavigationView.class.getDeclaredField("mMenuView");
 f.setAccessible(true);
 BottomNavigationMenuView menuView = (BottomNavigationMenuView) f.get(this);

 try {
 Method method = menuView.getClass().getDeclaredMethod("activateNewButton", Integer.TYPE);
 method.setAccessible(true);
 method.invoke(menuView, index);
 } catch (SecurityException | NoSuchMethodException | IllegalAccessException | InvocationTargetException e) {
 e.printStackTrace();
 }
 } catch (IllegalAccessException e) {
 e.printStackTrace();
 } catch (NoSuchFieldException e) {
 e.printStackTrace();
 }
 }

}
</code></pre>

And then use it in your xml layout file.

<pre><code>&lt;com.your.app.SelectableBottomNavigationView
 android:id="@+id/bottom_navigation"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 app:itemBackground="@color/primary"
 app:itemIconTint="@drawable/nav_item_color_state"
 app:itemTextColor="@drawable/nav_item_color_state"
 app:menu="@menu/bottom_navigation_menu"/&gt;
</code></pre>

blocks|key|4389469|text|如果你不想修改你的代码。如果是这样的话，我建议你试试BottomNavigationViewEx。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|4389470|您只需替换、调用方法setCurrentItem(index);和getCurrentItem()即可。|style|CODE|4389471|​|4389472|📷|atomic|4389473|4389474|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/ittianyu/BottomNavigationViewEx|1|IMAGE|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/d03846ce85838790f821e8d6fad3508a.gif|imageAlt^0|Q|M|0|0|A|M|X|G|0|0|0|1|1|0|0^^$0|@$1|2|3|4|5|6|7|11|8|@]|9|@$A|12|B|13|1|14]]|C|$]]|$1|D|3|E|5|6|7|15|8|@$A|16|B|17|F|G]|$A|18|B|19|F|G]]|9|@]|C|$]]|$1|H|3|I|5|6|7|1A|8|@]|9|@]|C|$]]|$1|J|3|K|5|L|7|1B|8|@]|9|@$A|1C|B|1D|1|1E]]|C|$]]|$1|M|3|I|5|6|7|1F|8|@]|9|@]|C|$]]|$1|N|3|-4|5|6|7|1G|8|@]|9|@]|C|$]]]|O|$P|$5|Q|R|S|C|$T|U]]|V|$5|W|R|X|C|$Y|Z|10|-4]]]]

I you don't want to modify your code.
If so, I recommended you to try <a href="https://github.com/ittianyu/BottomNavigationViewEx" rel="nofollow noreferrer">BottomNavigationViewEx</a>。

You just need replace call a method <code>setCurrentItem(index);</code> and <code>getCurrentItem()</code>。

<img src="https://github.com/ittianyu/BottomNavigationViewEx/raw/master/read_me_images/with_view_pager.gif" alt="Click here to view the image">

blocks|key|4389507|text|只是添加了另一种编程执行选择的方法-这可能是最初的目的，也可能是后来添加的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4389508|Menu+bottomNavigationMenu+=+myBottomNavigationMenu.getMenu();
bottomNavigationMenu.performIdentifierAction(selected_menu_item_id,+0);|code-block|syntax|javascript|4389509|performIdentifierAction接受Menu项id和标志。|offset|length|style|CODE|4389510|有关更多信息，请参阅documentation。|4389511|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.android.com/reference/android/view/Menu.html#performIdentifierAction(int,%2520int)^0|0|0|0|N|P|4|0|A|D|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Y|8|@$I|Z|J|10|K|L]|$I|11|J|12|K|L]]|9|@]|A|$]]|$1|M|3|N|5|6|7|13|8|@]|9|@$I|14|J|15|1|16]]|A|$]]|$1|O|3|-4|5|6|7|17|8|@]|9|@]|A|$]]]|P|$Q|$5|R|S|T|A|$U|V]]]]

Just adding another way to perform a selection programatically - this is probably what was the intention in the first place or maybe this was added later on.

<pre><code>Menu bottomNavigationMenu = myBottomNavigationMenu.getMenu();
bottomNavigationMenu.performIdentifierAction(selected_menu_item_id, 0);
</code></pre>

The <code>performIdentifierAction</code> takes a <code>Menu</code> item id and a flag.

See the <a href="https://developer.android.com/reference/android/view/Menu.html#performIdentifierAction(int,%20int)" rel="nofollow noreferrer">documentation</a> for more info.

blocks|key|4389753|text|在API25上面你可以使用setSelectedItemId(menu_item_id)，但在API25下你必须做不同的事情，用户菜单得到句柄，然后setChecked到选中的特定项目|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4389754|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Above API 25 you can use setSelectedItemId(menu_item_id)
but under API 25 you must do differently,
user Menu to get handle and then setChecked to Checked specific item

blocks|key|4389970|text|navigationView.getMenu().findItem(R.id.navigation_id).setChecked(true);|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|4389971|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>navigationView.getMenu().findItem(R.id.navigation_id).setChecked(true);
</code></pre>

blocks|key|4389663|text|我向谷歌提出了一个问题，那就是没有可靠的方法来选择BottomNavigationView上的页面：https://code.google.com/p/android/issues/detail?id=233697|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|4389664|NavigationView显然也有类似的问题，他们通过添加一个新的setCheckedItem()方法修复了这个问题。|4389665|entityMap|0|LINK|mutability|MUTABLE|url|https://code.google.com/p/android/issues/detail?id=233697^0|1E|1L|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]]|C|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@]|C|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]]]

I made a bug to Google about the fact that there's no reliable way to select the page on a BottomNavigationView: <a href="https://code.google.com/p/android/issues/detail?id=233697" rel="nofollow noreferrer">https://code.google.com/p/android/issues/detail?id=233697</a>

NavigationView apparently had a similar issue, which they fixed by adding a new setCheckedItem() method.

blocks|key|4389546|text|我希望这能帮到你|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4389547|//Setting+default+selected+menu+item+and+fragment
++++++++bottomNavigationView.setSelectedItemId(R.id.action_home);
++++++++getSupportFragmentManager()
++++++++++++++++.beginTransaction()
++++++++++++++++.replace(R.id.fragment_container,+new+HomeFragment()).commit();|code-block|syntax|javascript|4389548|它更多的是确定与相应的底部导航菜单项同时加载的默认片段。您可以在您的OnResume回调中包含相同的内容|4389549|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

I hope this helps 

<pre><code>//Setting default selected menu item and fragment
 bottomNavigationView.setSelectedItemId(R.id.action_home);
 getSupportFragmentManager()
 .beginTransaction()
 .replace(R.id.fragment_container, new HomeFragment()).commit();
</code></pre>

It is more of determining the default fragment loaded at the same time with the corresponding bottom navigation menu item.
You can include the same in your OnResume callbacks

blocks|key|4389590|text|private+void+setSelectedItem(int+actionId)+{
++++Menu+menu+=+viewBottom.getMenu();
++++for+(int+i+=+0,+size+=+menu.size();+i+<+size;+i%2B%2B)+{
++++++++MenuItem+menuItem+=+menu.getItem(i);
++++++++((MenuItemImpl)+menuItem).setExclusiveCheckable(false);
++++++++menuItem.setChecked(menuItem.getItemId()+==+actionId);
++++++++((MenuItemImpl)+menuItem).setExclusiveCheckable(true);
++++}
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|4389591|该解决方案唯一的“缺点”是使用MenuItemImpl，它是库的“内部”(尽管是公共的)。|unstyled|offset|length|style|CODE|4389592|entityMap^0|0|F|C|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|N|8|@$G|O|H|P|I|J]]|9|@]|A|$]]|$1|K|3|-4|5|F|7|Q|8|@]|9|@]|A|$]]]|L|$]]

<pre><code>private void setSelectedItem(int actionId) {
 Menu menu = viewBottom.getMenu();
 for (int i = 0, size = menu.size(); i &lt; size; i++) {
 MenuItem menuItem = menu.getItem(i);
 ((MenuItemImpl) menuItem).setExclusiveCheckable(false);
 menuItem.setChecked(menuItem.getItemId() == actionId);
 ((MenuItemImpl) menuItem).setExclusiveCheckable(true);
 }
}
</code></pre>

The only 'minus' of the solution is using <code>MenuItemImpl</code>, which is 'internal' to library (though public).

blocks|key|4390005|text|要更改Tab，此代码可以正常工作！|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4390006|++++activity?.supportFragmentManager?.beginTransaction().also+{+fragmentTransaction+->
++++++++fragmentTransaction?.replace(R.id.base_frame,+YourFragment())?.commit()
++++}

++++val+bottomNavigationView:+BottomNavigationView+=+activity?.findViewById(R.id.bottomNavigationView)+as+BottomNavigationView
++++bottomNavigationView.menu.findItem(R.id.navigation_item).isChecked+=+true|code-block|syntax|javascript|4390007|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

To change the Tab, this code works!
<pre><code> activity?.supportFragmentManager?.beginTransaction().also { fragmentTransaction -&gt;
 fragmentTransaction?.replace(R.id.base_frame, YourFragment())?.commit()
 }

 val bottomNavigationView: BottomNavigationView = activity?.findViewById(R.id.bottomNavigationView) as BottomNavigationView
 bottomNavigationView.menu.findItem(R.id.navigation_item).isChecked = true
</code></pre>

I am using the new <code>android.support.design.widget.BottomNavigationView</code> from the support library.
How can I set the current selection from code? I realized, that the selection is changed back to the first item, after rotating the screen. Of course it would also help, if someone could tell me, how to "save" the current state of the <code>BottomNavigationView</code> in the <code>onPause</code> function and how to restore it in <code>onResume</code>.

Thanks!

Set selected item in Android BottomNavigationView

我正在使用支持库中的新android.support.design.widget.BottomNavigationView。如何从代码中设置当前选择？我意识到，在旋转屏幕后，选择被改回第一项。当然，如果有人能告诉我，如何在onPause函数中“保存”BottomNavigationView的当前状态，以及如何在onResume中恢复它，它也会有所帮助。谢谢!

问在Android BottomNavigationView中设置选中项
EN

回答 17

Stack Overflow用户

Stack Overflow用户

Stack Overflow用户

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问在Android BottomNavigationView中设置选中项EN

回答 17

Stack Overflow用户

Stack Overflow用户

Stack Overflow用户

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问在Android BottomNavigationView中设置选中项
EN